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| Titel |
New Re-Os organic-rich shale and sulphide geochronology data from the Pre-Sturtian Chuar Group, Grand Canyon |
| VerfasserIn |
Alan Rooney, Jaqueline Austermann, David Selby, Carol Dehler, Karl Karlstrom, Francis Macdonald |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250130640
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| Publikation (Nr.) |
 EGU/EGU2016-10926.pdf |
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| Zusammenfassung |
| The Neoproterozoic Chuar Group is an exceptionally well-exposed and unmetamorphosed succession of siliciclastics and carbonates with a thickness of ~1600 m. Deposition of the Chuar Group began ~782 Ma and ended 742 ± 6 Ma (U-Pb detrital zircon data and U-Pb reworked tuff age, respectively). The Chuar Group hosts an assemblage of diverse microfossils including vase-shaped microfossils and records major perturbations to biogeochemical cycles. Here we present new Re-Os geochronology data from organic-rich shale and from sulphide (marcasite) that further constrain the duration and depositional history of this pre-Sturtian succession and enhances global correlation with other Neoproterozoic sedimentary successions. In addition to the new geochronology data, we also present a more complete statistical analysis of uncertainties in the Re-Os shale geochronometer in an effort to quantify the different contributors to age uncertainties and identify opportunities to reduce them. This will help to further integration of Re-Os into the EARTHTIME initiative. |
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